Art of fastening sheets together.



H. ROSENBERG.

ABT or FAsTENlNG SHEETS TOGETHER.

APPLICATION FILED AFRV. I6. |917.

Patented Apr. 1,1919.

4M eltlfozuaq.

willy/Il l UNITED STATES inlrirEia'i oEEioE.

IEEYMAN BOSENBEBG, OF NEW YORK., N'. Y.

To all whom t may concern.' I

Be it 'lmown that'I, HEYMAN RosENBEno,

a citizenof the United States, residing at New York, in the county -ofNew York and State of New York, have invented certainA Anew and usefulImprovements lin the Art of Fastening Sheets Together; and I do' herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to 'which itappertains. to make and use the same.

This invention relates to improvements in the art of fastening togethersheets of metal and other like relatively thin sheets of.`

material. p ,y

The object in view is to easily, vquickly and permanently fastentogether in a simple and inexpensive manner a plurality of sheets ofrelatively thin material such as sheet iron and the like.

With this 4and other objects in view, as

will in part be stated and in part hereinafter become apparent, theinvention comprises certain improved steps andl combinations of steps inthe art of fastenin togetherv relatively thin sheets of materia? as willbe subsequently specified and claimed.

In the accompanying drawin Figure 1 is a view 1n side e evation of ascrew such as is particularly well'adapted vfor carrying out thepreferred combination of steps of the present improvement in the art offastening together relatively thin sheets. j

Fig. 2 is a sectional view through two sheets with a tool indicated inelevation in position for beginning the -rst step of the art or process.

Fig. 3. is a similar view of the same with the parts in the positiondurn the carrying out of the prooe such as may;l e designate as thecompletion of the rst stieg.

Fig. 4 is a view similar to g. 3 of the parts after the tool has beenremoved.

Figs. 5 and 6 are similar views, the former showin an intermediate step,and the latter the prouct upon completion of the process.

Fig. 7 is an enlarged, detail fragmentary view of the parts as seen inFi 6.

Fig. 8 is a view similar to Fig. 6 showing more than two sheetsconnected together.

In the art of fastening together metallic sheets, various methods havebeen proposed land the one usually preferred for such oonstruction workas cornices and metal trim on buildings, housings for blowers, andelsespeomcauoa er Letters Patent.

A31' or FAsTEmive. SHEETS TOGETHER.

where where for various reasons it is im# practicable or undesirable touse solder, has been to employ bolts of the machine screw type engagingthe plates atone face by the head of the bolt and at the other face bythe nut of the bolt. Much diiculty has been experienced in fasteningtogether sheets in this manner, 'both from the fact that it isfrequently difficult to provide access to the nut, and lfrom the factthat variations in temperature and vibrations cause the nut toL loosen.

The object of the resent invention is to overcome yall these diicultiesby employing v a method of connection which eliminates the need formachine thread, eliminates the nut, and produces a connection which isstable in every respect and which throughout long and careful tests hasproved to remain absolutelyl tight notwithstanding vibrations andtemperature variations. p

The steps of the present improved process or art, and one specificsequence or coinbination thereof, may more readily be 4ren- 80 deredclear. by reference to such structural formations as are effected by theprocess as, forv example, such as is illustrated in the accompanyingdrawin in which 1 indicates the body of a screw w ose thread 2 is of the85 form and pitch of what is known as a.wood screw by which is meant thecommercial iron screw adapted for use in wood. The body 1 tapers to apoint at one end and at the other end is notched head 3. n other words,the screw is of the shape of the ordinary commercial wood screw, butdiffers therefrom in 'the fact that the screw is made of Steel andthatthe thread 2 is hardened 'preferabl special case-hardening process, as ythe known cyanid recess oritsequiv-alent. The structure of t e screw,therefore, consists essentially of a body whose thread is hardened whilethere is no attempt ator need '100 .for hardening of the body. Incidentto the treatmentin hardeni the thread 2, the surface of the body of t escrew may also be l hardened, but that is an incidental result and notone necessar to the effective operation of the screw, t eessentiar'sieed being that the thread itself shall be li 'rdened andprovided with a cutting ed e, su'ch as seen at 2' in Fig. 7, and that te body of the screw shall terminate in a tapered end with y the threadcorrespondingly tapering.

The sheet material to be QQIlllected together.

' Patented Apr. 1, 1919. Appnoaudainiea April is, i917. 'serial No.162,488. i

rovided with the usual 90 i byaes may have quite a wide variation inthickness, but is usually sufficiently thin to be susceptible ofperforation by some form of punching apparatus whether manually ormachine operated. Perhaps the widest iield of utility of the presentimprovement in the art nds ap plication in the connecting of relativelythin sheets of material such as galvanized iron,

ordinary sheet iron, and tin coated or plated iron, commonly known assheet tin, and like thin sheets of material, but it will become obviousthat the invention is just as applicable to sheets of material havinggreater thickness. For the sake of illustration, however, I. haveselected the thinner sheets for disclosure of the invention herein, andto this end it will be noted that the two sheets of metal 4 and 5 arearranged in contact face to face, and the tool, 6, which in the presentinstance is an ordinary hand punch having the usual limiting shoulder 7is arranged with its point in contact with the-plate 4 in position forpenetrating the two plates. A blow on the punch 6, as by a hammer notillustrated or force otherwise applied, causes the punch 6 to penetratethe sheets 4 and 5 until the punch assumes the position indicated inFig. 8, resulting in the perforation of the ltwo sheets and theformation of a bunon each, the two burs being nested as clearly seen at4 and 5 in Fig. 4. The penetrating point portion of-the punch 6 is ofless diameter than the diameter of va circle' such as would touchdiametrically opposite points of any helix of the larger portion of thethread 2, and is vpreferably of approximately the size of the body l, sothat the screw cannot be introduced into theopening surrounded by theburs 4 and 5 except by revolving the screw and thus causing thev thread2 to cut a corresponding or female thread in the burs 4 and 5. As thethread 2 is tapered to the end of the body 1 the thread has an excellentopportunity to enter and get an eifective start in the cutting of afemale thread. For thin sheets of metal, it is usually sufficient toprovide an ordinary hand-operated screwdriver for revolving the screwand thus Y threading the same down from the position indicated in Fig. 5to the position indicated in Fig. 6, that is, the screw is threaded homeand made tight. In doing so, the female thread is cut in the inner faceof the bur 4 across the edge ofthe bur and across the edge of the bur 5which slightly underhangs the edge of the bur 4 so that the thread ofthe screw assumesthe position with respect to the bur seen in detail inFig.. 7. The head.

3 resting on the upper surface of the plate 4 and the thread 2 engagingthe edge of the br 5 coperate to prevent separation of the s eets.

It should be observed that in the carrying out of the process or art oneof the essential steps 1s the penetration or cutting of the being of thethread of the screw, and the thread metal of the sheets by the thread ofthe screw without appreciably varying the condition of that thread. Thisfeature of the improved art cannot be accomplished with an ordinary woodscrew or any screw having a soft thread. My experience after long andthori ough testing has been that a screw having a soft thread may beused to connect sheet metal, but the soft threads usually suffer as muchcutting away or abrasion as do thel sheets which the thread engages, andthe result is that the soft threaded screw will not hold, whereas theresult of the present improved art including that Apenetration orcutting of the metal of the sheets which occurs from the use of hardenedthreads is such that the sheets are permanently secured together againstdisconnection under the most severel trying conditions.

' It should e obvious that this invention is not limited to the art ofconnecting any specific number of sheets, since the same steps threadinga screw having a hardened thread.

through the burs to a position with the thread in engagement with theburs in a manner causing the thread to cut into `the material of thesheets for retaining the sheets against separation.

2. A process of securing together a plurality of metallic sheetscomprising forming an entering opening through the sheets and forciblythreading a screw having a hardened thread into said opening, the screwhaving a thread proportioned with respect to theV entering opening tooutstand beyond 311e same and to cut into the material of the 3. Aprocess o f securing together a plui rality of metallic sheetscomprising perforating 'the sheets to form an entering openingtherethrough and forcibly threading into said opening a screw whosethread is hardened and of substantially high pitch and proportionedwlth'respect to the opening such as to have the edges of the threadextend laterally beyond the opening and to cut iro thematerial of thesheets.

an entering opening` through t e sheets, placing in the opening thesmaller end of a tapered screw and forcibly threading the screwA homeinto the openlng, the opening of less diameter than the main portion ssof securing together a plu-AA rality o `metallic sheets comprisinforming iso of the screw being of harder material than the sheets andcutting intothe sheets as the screw is forcibly threaded home.

5.]A process ,of securing together a pluralty of metallic sheetscomprising forming an entering opening through the sheets, positioningin the opening the pointed portion of a screw of the conventional woodscrew shape but having a hardened thread and forcibly threading thescrew into vthe opening, the opening being of less diameter than .thatof -the larger portion of the screw thread so'as to cause the thread ofthe screw to cut into the material of the sheet metal.

6. A process of securing together a plurality of metallic sheetscomprising perforating the said sheets and forming nested sheetssurroundtion the point portion of -a screw of the shape of aconventional wood screw and having a hardened screw thread, theperforation being of less diameter than the larger portion of the screwthread= and forcibly threading the screw through said perforation to aposition with the head of the screw engaging that one of vthe metallicsheets first approached by the screw while the thread of the screwengages and-is embedded in the material of the burs.

7 In the art of fastening together sheets of metal, forming an enteringopening thro'ugh a plurality of such sheets in contact with each other,placing in said opening the tip of a screw conformmg generally in odyand thread contour with that of a wood screw and having the threadhardened and 'extending substantially from the tapered tip HEYMANRosENBERG.

i Witnesses:

ALMoN B. CALKINs, MARCEL SENER.

DISCLAIMER 1 ,299,232*.-Heg/1mz'n,l Rosenberg, New York, N. Y. ART 0FFAS'rENrNcr SHEETS TOGETHER. Patent dated April l, 1919. Disclaimerfiled March 28, 1932, by

. the patentes and the exclusive licensee, Parker-Kalou Corporation.

Hereby enter their disclaimer of said claims 1 2, 3, 4, 5, 6, and 7 ofsaid United States Letters Patent No. 1,299,232, which claims are in thefollowing words, to wit: 1.. A process, of securing together a pluralityof sheets of material comprising perforatingthe sheets in a mannerforming nested burs surrounding the perforation and threading a screwhaving a hardened thread through the. burs to a position with the threadin engagement with the burs in a manner causing the thread to cut into.the

material of the sheets for retaining the sheets against separation.

2. A process of securing together a plurality of metallic sheetscomprisingforming an entering opening through the sheets and forciblythreading a screw having a hardened thread into said opening, thescrewvhaving a thread proportioned with respect to the entering openingto entstand beyond the same and to cut into the material of the sheets;

3; A rocess of securing together a plurality of metallicsheetscomprising perforating t e sheets to forman enteringopeningtherethrough -and forcibly threading into said openinga screw whosethread is hardened and ofsubstantially high pitch 'and pro ortioned withrespect to the opening such as to have the edges of the thread extendaterally beyond the opening and to cut into 'the material ofthe sheets.

'4. Afprocess of securing together a-plurality of metallic sheetscomprising forml lng an entering openingthrough the sheets, placing inthe opening the smaller end of ,a tapered screw and forcibly threadingthe screw home into the opening, the opening being of less diameter thanthe main portion of the thread of the screw, and the thread ofthe'screwbeing of harder material than the sheets and cutting into the sheets asthe screw is forcibly'threaded home.

. 5. A process of securing together a plurality of metallic sheetscomprising forming an entering opening through' the sheets, positioningin the opening the pointed portion of a screw of the conventional woodscrew shape but having a hardened threadand forcibly threading the screwinto the opening, the opening being of less diameter than that of thelarger portion of the screw thread so as to cause the 'threadforating tof the screw to cut into the'material'ofthe sheet metal. 6; A process ofsecuring together a plurality of metallic sheets comprising peresaidsheets and forming nested burs in the material of the sheetsurrounding the perforation, placing in the perforation the pointportion of a screw of the shape 'of a conventional wood screw and havinga hardened screwthread, the perforation .being ofless diameter than thelarger portion of the screw thread, and forcibly threading thescrewthrough said perforation to a positionv with the head of the screwvengaging that one of the metallic .sheets first approached bythe screwwhile the 'thread of the screw engages and is embedded in the materialof the burs.

A7. In the art of fastening together sheets of metal, forming anentering opening through -a plurality of su'ch sheetsin contact 'witheach other, placing in said opening -the-V tip of' a screw conforminggenerally in body and thread contour with that of a ,wood screw andhaving the thread hardened and extending substantially vfrom thetapered'tip to the hea of the screw, the entering opening being ofsubstantially no greater diameter than the body of the screw, andforcibly rotating the screw until the hardened thread thereof cuts itsway in the material of the sheets to a point 0f contact o f the head ofthe screw with one of the sheets.

[Qcid Gazeta Aprill?, 1.932]

